Acer C720/C720P Chromebook

dhead · 2015-06-26 23:24:36

Please note that John Lewis added to his custom firmware script an option to only update BOOT_STUB part of the firmware (in comparison to flashing the full firmware).
BOOT_STUB updating is the first option in the script (write_boot_stub function).
This method supposed to be safer (not sure why, disabling wp still required).

It's not clear yet if suspend working when choosing this method (VMX probably not supported), John posted that he will update when he'll get more feedback from users.

gothmog123 · 2015-06-27 14:34:19

nariox wrote:

@gothmog123: Are you using the USB3 or USB2 ports? Some usb devices seem to dislike being plugged to the "wrong" port. It might also be that this device pulls more current than the C720 is willing to provide.

Thanks, I am afraid it's going to be the latter - the usb 2.0 port works even worse. It seems like a such a small delicate device. And I suppose there is no workaround for low current...

nariox · 2015-06-27 21:45:41

@gothmog: you can try using a powered hub, although that seems a little extreme. What happened to your internal one? Your dongle might be out of spec, might be easier to get another one.

gothmog123 · 2015-07-01 08:18:23

nariox wrote:

@gothmog: you can try using a powered hub, although that seems a little extreme. What happened to your internal one? Your dongle might be out of spec, might be easier to get another one.

I need to use an external one because of an irrelevant reason. I'm trying to get wifi from across the street which means i need to use external directional antennas, and those only hook up to external long range adapters.

Last edited by gothmog123 (2015-07-01 08:18:38)

nariox · 2015-07-01 17:18:50

@gothmog123: hmm, I wonder if the two ath9ks are interferring with each other. Have you tried removing the internal one? (I know it sounds really drastic, but it might be the way to diagnose the real origin of the problem). Although I still feel like it might be a power issue. You can (before disassembling your C720) try using a powered usb hub and see what happens.

karag · 2015-07-05 23:21:16

Hi all -
I seem to be suffering the dreaded battery discharge issue - went on holiday for a week and forgot it was sleeping rather than powered off.
I have a lot of data on there I need to retrieve!
I've tried to follow the instructions here - http://dev.chromium.org/chromium-os/dev … n-dev-mode

I have the .bin file and have written it to USB stick. It's when I get to the part about clearing flag bits that I hit a problem.
My partition table looks like so:

GNU Parted 3.2
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) unit B                                                           
(parted) print                                                            
Error: The backup GPT table is corrupt, but the primary appears OK, so that will be used.
OK/Cancel? OK                                                             
Warning: Not all of the space available to /dev/sdb appears to be used, you can fix the GPT to use all of the space (an extra 12628032 blocks) or continue with the current setting? 
Fix/Ignore? I                                                             
Model:  USB DISK 2.0 (scsi)
Disk /dev/sdb: 8011120640B
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start        End          Size         File system  Name        Flags
11      32768B       8421375B     8388608B                  RWFW
 6      8421376B     8421887B     512B                      KERN-C
 7      8421888B     8422399B     512B                      ROOT-C
 9      8422400B     8422911B     512B                      reserved
10      8422912B     8423423B     512B                      reserved
 2      10485760B    27262975B    16777216B                 KERN-A
 4      27262976B    44040191B    16777216B                 KERN-B
 8      44040192B    60817407B    16777216B    ext4         OEM         msftdata
12      127926272B   144703487B   16777216B    fat16        EFI-SYSTEM  boot, esp
 5      144703488B   146800639B   2097152B                  ROOT-B
 3      146800640B   1499463679B  1352663040B  ext2         ROOT-A
 1      1499463680B  1528823807B  29360128B                 STATE       msftdata

So I'm calling the enable_rw_mount script like so:

[root@me stuff]# ./enable_rw_mount.sh /dev/sdb 146800640
enable_rw_mount called on non-ext2 filesystem: /dev/sdb 146800640

But when I try to mount the partition I get an error message:

[root@me stuff]# mount /dev/sdb3 /mnt/
mount: wrong fs type, bad option, bad superblock on /dev/sdb3,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

dmesg tells me:

[60100.978475] Alternate GPT is invalid, using primary GPT.
[60100.978494]  sdb: sdb1 sdb2 sdb3 sdb4 sdb5 sdb6 sdb7 sdb8 sdb9 sdb10 sdb11 sdb12
[60248.377058] EXT4-fs (sdb3): couldn't mount RDWR because of unsupported optional features (ff000000)
[60260.548575] EXT4-fs (sdb3): couldn't mount RDWR because of unsupported optional features (ff000000)

I guess the enable_rw_mount script is not working somehow, but I don't know how to diagnose or where to look for more info.
Will be very grateful for any tips or suggestions please!
Thanks all --

porphyry5 · 2015-07-06 18:48:13

current Arch Linux a 3.18.0-1-mainline #1 SMP PREEMPT Mon Oct 20 16:34:06 CEST 2014 i686 GNU/Linux

Got this error installing xf86-input-cmt-xorg during makepkg -s

 checking if gcc supports -Werror=attributes... yes
./configure: line 18017: --print-errors: command not found
checking whether make supports nested variables... (cached) yes
./configure: line 18156: syntax error near unexpected token `XORG,'
./configure: line 18156: `PKG_CHECK_MODULES(XORG, xorg-server xproto inputproto

Last edited by porphyry5 (2015-07-06 19:41:59)

rh1n0 · 2015-07-16 19:24:33

Is there anyboy else having issues with their HDMI output after upgrading their system? My HDMI output was working fine this morning, but stopped working after I performed a full system upgrade. I have tried downgrading cinnamon, xorg packages and kernel without any luck.

Daviljoe193 · 2015-07-17 23:20:11

Recently, X.Org has been quite unstable on my C720p, crashing at least once every other day. I think it has to do with the new Intel driver, though I could be wrong, though that was what I remember getting updated before the issue arouse.

EDIT: The s*** stopped hitting the fan, and Chrome Unstable is shockingly more stable than Chrome Beta, though I updated X.Org and changed Chrome channels around the same time, so I don't know which was the solution. Although I had to edit /etc/X11/xorg.conf.d/10-monitor.conf to re-disable screen blanking after the update

Last edited by Daviljoe193 (2015-07-25 03:05:04)

dhead · 2015-07-18 01:52:27

Also experiencing some X issues here since last packages update, I wasn't sure who's to blame as I only noticed it affecting Chromium so far and I'm also on kernel 4.2.0 RC.
Didn't had the time to debug it yet or report to freedesktop but there's definitely a bug.

kernel: [drm:check_crtc_state [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
kernel: ------------[ cut here ]------------
kernel: WARNING: CPU: 0 PID: 753 at drivers/gpu/drm/i915/intel_display.c:12319 check_crtc_state+0x8df/0xf80 [i915]()
kernel: pipe state doesn't match!
kernel: Modules linked in: rfcomm rpcsec_gss_krb5 nfsv4 dns_resolver fuse sha256_ssse3 sha256_generic hmac drbg ansi_cprng ctr ccm bnep snd_hda_codec_hdmi hid_logitech_hidpp ath3k btusb btrtl btbcm btintel bluetooth hid_logitech_dj usbhid hid joydev mousedev nvram msr cyapatp crc_itu_t arc4 tpm_infineon ath9k ath9k_common ath9k_hw ath iTCO_wdt iTCO_vendor_support mac80211 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm chromeos_laptop crct10dif_pclmul crc32_pclmul crc32c_intel cfg80211 ghash_clmulni_intel cryptd evdev input_leds mac_hid snd_hda_codec_realtek i915 snd_hda_codec_generic pcspkr serio_raw rfkill snd_hda_intel snd_hda_codec uvcvideo drm_kms_helper videobuf2_vmalloc videobuf2_memops videobuf2_core snd_hda_core i2c_i801 v4l2_common snd_hwdep lpc_ich
kernel:  shpchp fan drm snd_pcm videodev snd_timer snd tpm_tis intel_gtt i2c_designware_pci dw_dmac_pci media i2c_algo_bit thermal battery ac soundcore tpm video dw_dmac dw_dmac_core i2c_designware_platform i2c_designware_core i2c_core spi_pxa2xx_platform processor 8250_dw gpio_lynxpoint button sch_fq_codel nfsd nfs auth_rpcgss oid_registry nfs_acl lockd fscache grace sunrpc ip_tables x_tables ext4 crc16 mbcache jbd2 sd_mod atkbd libps2 i8042 serio sdhci_acpi sdhci led_class mmc_core ahci libahci libata xhci_pci xhci_hcd scsi_mod usbcore usb_common
kernel: CPU: 0 PID: 753 Comm: Xorg Tainted: G        W       4.2.0-1-mainline #1
kernel: Hardware name: Acer Peppy, BIOS          10/18/2013
kernel:  0000000000000000 0000000021ddf50d ffff880174557438 ffffffff81565a79
kernel:  0000000000000000 ffff880174557490 ffff880174557478 ffffffff810737e6
kernel:  ffff880174557478 ffff880176a2db50 ffff880176c1a000 ffff880176a2d800
kernel: Call Trace:
kernel:  [<ffffffff81565a79>] dump_stack+0x4c/0x6e
kernel:  [<ffffffff810737e6>] warn_slowpath_common+0x86/0xc0
kernel:  [<ffffffff81073875>] warn_slowpath_fmt+0x55/0x70
kernel:  [<ffffffffa05b5dff>] check_crtc_state+0x8df/0xf80 [i915]
kernel:  [<ffffffffa05c8806>] intel_modeset_check_state+0x216/0xb50 [i915]
kernel:  [<ffffffffa05c2e5f>] ? __intel_set_mode+0x9bf/0xbb0 [i915]
kernel:  [<ffffffffa05c9e05>] intel_crtc_set_config+0x485/0x600 [i915]
kernel:  [<ffffffffa04279f6>] drm_mode_set_config_internal+0x66/0x100 [drm]
kernel:  [<ffffffffa04f64f2>] restore_fbdev_mode+0xc2/0xf0 [drm_kms_helper]
kernel:  [<ffffffffa04f8459>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x70 [drm_kms_helper]
kernel:  [<ffffffffa04f84c2>] drm_fb_helper_set_par+0x22/0x40 [drm_kms_helper]
kernel:  [<ffffffffa05d84ca>] intel_fbdev_set_par+0x1a/0x60 [i915]
kernel:  [<ffffffff81326dcf>] ? fb_set_var+0x2ef/0x460
kernel:  [<ffffffff81326d16>] fb_set_var+0x236/0x460
kernel:  [<ffffffff810bac92>] ? cpuacct_charge+0x52/0x60
kernel:  [<ffffffff810a6e75>] ? update_curr+0xd5/0x160
kernel:  [<ffffffff810a45fb>] ? set_next_entity+0xab/0x440
kernel:  [<ffffffff8131d902>] fbcon_blank+0x312/0x360
kernel:  [<ffffffff81397cb3>] do_unblank_screen+0xc3/0x190
kernel:  [<ffffffff8138daed>] complete_change_console+0x5d/0xe0
kernel:  [<ffffffff8138ee30>] vt_ioctl+0x12c0/0x12e0
kernel:  [<ffffffff81186f3d>] ? do_wp_page+0xdd/0x5e0
kernel:  [<ffffffff81382245>] tty_ioctl+0x3b5/0xba0
kernel:  [<ffffffff81189ec2>] ? handle_mm_fault+0xd82/0x17a0
kernel:  [<ffffffff811e20d5>] do_vfs_ioctl+0x295/0x480
kernel:  [<ffffffff811ec1c7>] ? __fget+0x77/0xb0
kernel:  [<ffffffff811e2339>] SyS_ioctl+0x79/0x90
kernel:  [<ffffffff8156af6e>] entry_SYSCALL_64_fastpath+0x12/0x71
kernel: ---[ end trace 1e1d2eac6d8d90bf ]---

p.s.
I gave up on HDMI long ago, for me it was never really a smooth ride with the C720 and HDMI.

Last edited by dhead (2015-07-18 01:53:25)

Daviljoe193 · 2015-07-18 20:40:08

I've gotten X.Org to crash when playing 720p60fps video from YouTube on Google Chrome Beta (google-chrome-beta 44.0.2403.89-1). I've also gotten some weird glitchiness when playing a 720p60fps video from Twitch in mpv (After downloading it using youtube-dl, though if you fed it the Source quality URL from youtube-dl into mpv, it'd probably do the same thing.), though the weird thing is that it showed up in a screenshot, which I didn't expect to actually show this issue. As a sidenote, I currently am not able to reproduce the second issue, though I will post another screenshot if I can get the issue to reoccur.

Last edited by Daviljoe193 (2015-07-23 11:53:51)

jason.oliveira · 2015-07-19 11:23:49

I seem to be having issues with my brand-new C720P.

Installed arch about 3 hours ago on the unit, and I'm unable to use the trackpad. was definitely working in chromeOS. I've installed xf86-input-cmt-xorg, and am not getting any response from the trackpad. dmesg doesn't show anything being loaded, nor does lsusb (one would assume the trackpad would show up). dmidecode does provide output:

Handle 0x0007, DMI type 41, 11 bytes
Onboard Device
Reference Designation: trackpad
Type: Other
Status: Enabled
Type Instance: 37
Bus Address: 0001:67:00.0

but nothing is using the cmt driver. Xorg.0.log was showing it being loaded and being used by a 2.4ghz wireless mouse I had plugged in, but not for the trackpad, which isn't being found. touchscreen works (but sucks), so it just looks like the script in xorg.conf.d/ not being able to match to a device.

both the user and gdm/sddm (tried both) are members of input group, so I don't think that's the issue. journalctl showed nothing mentioning "cmt" either.

any help would be very appreciated. I'll post any outputs needed. Thanks in advance.

Last edited by jason.oliveira (2015-07-19 11:25:54)

joebonrichie · 2015-07-25 11:55:43

jason.oliveira wrote:

xf86-input-cmt problems

I thought all issues had been fixed - in fact I recently reinstalled to enable system encryption and all I had to do was install xf86-input-cmt-xorg(xf86-input-cmt AUR4) and run usermod -a -G input j.

Hope its not an issue with the C720P although other users mentioned it working.

Could you use gdm for debugging as it provides verbose output by default without changing the log level.

Check this is here (note to self check if 20-touchscreen.conf needs to be symlinked for C720P users)

$ ls -la /etc/X11/xorg.conf.d/
-rw-r--r-- 1 root root  232 Jul 25 12:05 00-keyboard.conf
lrwxrwxrwx 1 root root   39 Jul 25 11:57 20-mouse.conf -> /usr/share/xf86-input-cmt/20-mouse.conf
lrwxrwxrwx 1 root root   46 Jul 25 11:57 40-touchpad-cmt.conf -> /usr/share/xf86-input-cmt/40-touchpad-cmt.conf
lrwxrwxrwx 1 root root   52 Jul 25 11:57 50-touchpad-cmt-peppy.conf -> /usr/share/xf86-input-cmt/50-touchpad-cmt-peppy.conf

This should be Peppy, I don't think the touchscreen version has a different product name

# dmidecode | grep "Product Name"

Your user should be part of the input group

$ groups

Need to use GDM for this one

$ journalctl -b | grep cyapa

Hopefully you should see a bunch of ouput including:

Jul 25 12:34:22 AcerC720 /usr/lib/gdm/gdm-x-session[597]: (II) Using input driver 'cmt' for 'Cypress APA Trackpad (cyapa)'

Last edited by joebonrichie (2015-07-25 16:33:06)

Daviljoe193 · 2015-07-25 15:42:19

joebonrichie, I think you meant to quote porphyry5 or jason.oliveira, the touchpad on my C720p never once gave me any issues throughout the past 5 months I've owned it.

Last edited by Daviljoe193 (2015-07-25 15:43:59)

jason.oliveira · 2015-08-02 21:51:30

joebonrichie wrote:

I thought all issues had been fixed - in fact I recently reinstalled to enable system encryption and all I had to do was install xf86-input-cmt-xorg(xf86-input-cmt AUR4) and run usermod -a -G input j.
Hope its not an issue with the C720P although other users mentioned it working.

I find it odd that dmidecode finds the trackpad, but nothing else does.

joebonrichie wrote:

Could you use gdm for debugging as it provides verbose output by default without changing the log level.
Need to use GDM for this one
$ journalctl -b | grep cyapa
Hopefully you should see a bunch of ouput including:
Jul 25 12:34:22 AcerC720 /usr/lib/gdm/gdm-x-session[597]: (II) Using input driver 'cmt' for 'Cypress APA Trackpad (cyapa)'

some bad news here. changed from sddm to gdm, logged in (post-reboot, cos sddm killed my display after stopping), and did the following:

oliveiraj@gmmlt00001 ~ % sudo journalctl -b | grep cyapa
1 oliveiraj@gmmlt00001 ~ %                                                :(

joebonrichie wrote:

Check this is here (note to self check if 20-touchscreen.conf needs to be symlinked for C720P users)

$ ls -la /etc/X11/xorg.conf.d/
-rw-r--r-- 1 root root  232 Jul 25 12:05 00-keyboard.conf
lrwxrwxrwx 1 root root   39 Jul 25 11:57 20-mouse.conf -> /usr/share/xf86-input-cmt/20-mouse.conf
lrwxrwxrwx 1 root root   46 Jul 25 11:57 40-touchpad-cmt.conf -> /usr/share/xf86-input-cmt/40-touchpad-cmt.conf
lrwxrwxrwx 1 root root   52 Jul 25 11:57 50-touchpad-cmt-peppy.conf -> /usr/share/xf86-input-cmt/50-touchpad-cmt-peppy.conf

seems to be all there.

This should be Peppy, I don't think the touchscreen version has a different product name
# dmidecode | grep "Product Name"

oliveiraj@gmmlt00001 ~ % sudo dmidecode | grep "Product Name"    
        Product Name: Peppy

Your user should be part of the input group
$ groups 

oliveiraj@gmmlt00001 ~ % groups
lp wheel input users

any other ideas? I'm getting a little worried about this unit, as the trackpad worked fine before the switch.
I have not done a full firmware replacement on this system yet (only the BOOT_STUB). could that be part of the issue?
[EDIT: did full firmware replacement anyway. no change.]
Could this somehow be hardware?
Thanks for the help.

Last edited by jason.oliveira (2015-08-02 23:08:22)

nariox · 2015-08-03 23:02:58

@jason.oliveira: have you tried the synaptics driver instead? That will at least allow you to test whether your trackpad is working.

By the way, for those experiencing the kswapd0 thrashing, any solution for it? I have tried zram and zswap+regular swap, but to no avail. kswapd0 will just come and start eating up the cycles in my CPU (100% on one). Renice'ing it to 19, kinda helps, but not entirely. Any ways around it?

jason.oliveira · 2015-08-05 21:47:38

@nariox synaptics driver gives no input as well. Trackpad was working perfectly until I installed Arch.
I may try an ubuntu boot disk to see if it's an arch problem only.

Last edited by jason.oliveira (2015-08-05 22:18:23)

LeoFa · 2015-08-11 12:55:09

LeoFa wrote:

Just wanted to plug the Adata Premier Pro M.2 SSD's http://www.adata.com/index.php?action=p … 3&piid=291 as a good option for ssd upgrade.

I take it all back, my SSD has died half way into my vacation.. I'm currently running arch from a usb stick. I just got back, so i'll soon send this device back to ADATA. I'm just wondering why SSD's keep failing on our device, any idea?

jason.oliveira · 2015-08-11 18:43:08

Ubuntu does not have trackpad functionality either. Does this mean my trackpad is dead? It shows up in dmidecode, but nowhere else.

nariox · 2015-08-14 14:35:25

jason.oliveira wrote:

Ubuntu does not have trackpad functionality either. Does this mean my trackpad is dead? It shows up in dmidecode, but nowhere else.

It's possible your cable is loose inside. You could try opening your C720 and reconnecting the cable and maybe cleaning the contacts.

LeoFa wrote:

I take it all back, my SSD has died half way into my vacation.. I'm currently running arch from a usb stick. I just got back, so i'll soon send this device back to ADATA. I'm just wondering why SSD's keep failing on our device, any idea?

Did it die completely or did it start corrupting? It's possible that a firmware update would help. (that's what did it to my MyDigitalSSD)

Last edited by nariox (2015-08-14 14:36:31)

LeoFa · 2015-08-14 18:21:56

@nariox :
the system first kernel panic'd when in use;
then the drive wouldn't boot;
at that time I managed to get a little bit of data of the drive booting a arch live iso and mounting it read only (mostly pictures and some dotfiles) but when copying, the drive would sometimes die;
i did a fsck on the drive but that had no effect; also spit out I/O errors.
i've got a kernel panic / output captured from my mobile > https://imgur.com/jgSGmsI
so after a while it completely died.

ps. for the slight chance it isn't dead, i might try the drive on my SATA/M.2 adapter this weekend, before i send it in.

nariox · 2015-08-14 18:40:19

@LeoFa: hmm, seems similar to what I had when my SSD failed (before the firmware update). Are you using ext4? What about discard?

My guess is that these SSDs might have been released with faulty firmware. In addition to that, there were some reports of some SSDs failing when TRIM was enabled.

LeoFa · 2015-08-14 20:09:17

@nariox: don't know if it matters but it was ext4 with no encryption and i believe i had fstrim on a systemd timer, i have had btrfs xfs and f2fs before i settled with plain old ext4 again.

ihre · 2015-08-15 14:12:32

My terminal just freezes at random. Locally, I use termite, but when I SSH to my C720P I mostly use putty or xterm, it happens with every terminal emulator I've tried so far.

Unfortunately, I have no idea where to go from here, besides stracing the process (http://sprunge.us/YijG & http://sprunge.us/TaRb). I can't find anything related with journalctl either... I've removed the screw on the motherboard and boot to SeaBIOS by default, but I don't think that matters.

$ uname -a Linux mini 4.1.4-1-ARCH #1 SMP PREEMPT Mon Aug 3 21:30:37 UTC 2015 x86_64 GNU/Linux

nariox · 2015-08-18 11:51:18

LeoFa wrote:

@nariox: don't know if it matters but it was ext4 with no encryption and i believe i had fstrim on a systemd timer, i have had btrfs xfs and f2fs before i settled with plain old ext4 again.

Let us know what ADATA tells you. (Were you able to recover anything from the external enclosure?) Hopefully a firmware update solves our problem.

@ihre: does the terminal freeze, but the C720 continues to be responsive, or does the C720 also freeze? Are you using ps_enable=1 on the ath9k?

Arch Linux

#951 2015-06-26 23:24:36

Re: Acer C720/C720P Chromebook

#952 2015-06-27 14:34:19

Re: Acer C720/C720P Chromebook

#953 2015-06-27 21:45:41

Re: Acer C720/C720P Chromebook

#954 2015-07-01 08:18:23

Re: Acer C720/C720P Chromebook

#955 2015-07-01 17:18:50

Re: Acer C720/C720P Chromebook

#956 2015-07-05 23:21:16

Re: Acer C720/C720P Chromebook

#957 2015-07-06 18:48:13

Re: Acer C720/C720P Chromebook

#958 2015-07-16 19:24:33

Re: Acer C720/C720P Chromebook

#959 2015-07-17 23:20:11

Re: Acer C720/C720P Chromebook

#960 2015-07-18 01:52:27

Re: Acer C720/C720P Chromebook

#961 2015-07-18 20:40:08

Re: Acer C720/C720P Chromebook

#962 2015-07-19 11:23:49

Re: Acer C720/C720P Chromebook

#963 2015-07-25 11:55:43

Re: Acer C720/C720P Chromebook

#964 2015-07-25 15:42:19

Re: Acer C720/C720P Chromebook

#965 2015-08-02 21:51:30

Re: Acer C720/C720P Chromebook

#966 2015-08-03 23:02:58

Re: Acer C720/C720P Chromebook

#967 2015-08-05 21:47:38

Re: Acer C720/C720P Chromebook

#968 2015-08-11 12:55:09

Re: Acer C720/C720P Chromebook

#969 2015-08-11 18:43:08

Re: Acer C720/C720P Chromebook

#970 2015-08-14 14:35:25

Re: Acer C720/C720P Chromebook

#971 2015-08-14 18:21:56

Re: Acer C720/C720P Chromebook

#972 2015-08-14 18:40:19

Re: Acer C720/C720P Chromebook

#973 2015-08-14 20:09:17

Re: Acer C720/C720P Chromebook

#974 2015-08-15 14:12:32

Re: Acer C720/C720P Chromebook

#975 2015-08-18 11:51:18

Re: Acer C720/C720P Chromebook

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