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Since I upgraded to kernel 3 yesterday I can't get triple screens to work anymore with my laptop. I've had this setup running before. My laptop is docked and I would enable the second and third monitor with xrandr. With two screens enabled, I get the following error when trying to enable the third:
$ xrandr --output VGA-0 --mode 1920x1200
xrandr: cannot find crtc for output VGA-0The 2nd and 3rd monitor are able to run in the same mode, with the same timings. So I think they shared the same CRTC before.
$ xrandr -q
Screen 0: minimum 320 x 200, current 3520 x 1200, maximum 16384 x 16384
LVDS connected 1600x900+1920+0 (normal left inverted right x axis y axis) 345mm x 194mm
1600x900 60.0*+
...
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 546mm x 352mm
1920x1200 60.0*+
...
VGA-0 connected (normal left inverted right x axis y axis)
1920x1200 60.0 +
...$ xrandr --verbose | grep -A2 1920x1200
DisplayPort-2 connected 1920x1200+0+0 (0x63) normal (normal left inverted right x axis y axis) 546mm x 352mm
Identifier: 0x56
Timestamp: 55325
--
1920x1200 (0x63) 154.0MHz +HSync -VSync *current +preferred
h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 74.0KHz
v: height 1200 start 1203 end 1209 total 1235 clock 60.0Hz
--
1920x1200 (0x63) 154.0MHz +HSync -VSync +preferred
h: width 1920 start 1968 end 2000 total 2080 skew 0 clock 74.0KHz
v: height 1200 start 1203 end 1209 total 1235 clock 60.0HzThe screens can be active at the same time, all combinations of two monitors work.
I tried several other things, they all didn't work:
- running the VGA-0 screen via DisplayPort
- downgrading xorg-server{,-common} to the previous version
- forcing a crtc via the --crtc option of xrandr (tells me it still can't find a crtc)
- checking the ati driver, but that didn't change
Anyone else familiar with the problem?
For completeness the output of lspci:
$ lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation 2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579V Gigabit Network Connection (rev 04)
00:1a.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 2 (rev b4)
00:1c.2 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 3 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1d.0 USB Controller: Intel Corporation 6 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
01:00.0 VGA compatible controller: ATI Technologies Inc NI Seymour [AMD Radeon HD 6470M]
01:00.1 Audio device: ATI Technologies Inc Device aa98
24:00.0 FireWire (IEEE 1394): JMicron Technology Corp. IEEE 1394 Host Controller (rev 30)
24:00.1 System peripheral: JMicron Technology Corp. SD/MMC Host Controller (rev 30)
24:00.2 SD Host controller: JMicron Technology Corp. Standard SD Host Controller (rev 30)
25:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)Last edited by asm89 (2011-08-15 08:39:24)
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It was a kernel thing. Someone was so kind to fix it. I compiled a new kernel with the patch and everything works fine now. I think the patch will be included in the next kernel release?
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