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I have three issues with my lenovo t420s, they might be related but I'm just not smart enough to fix them.
1:By default the bios is set to using optimus, and if I leave it at that x starts up all right but I don't think it is using the discrete graphics card at all? If I change the bios to use discrete graphics X fails with message "no screen found". I have seen this is an issue with optimus-laptops but I have also seen reports of getting it to boot of the discrete graphics card. So my question is simply, should it be possible to boot it of the discrete graphics card? (I have tried using both nouveau and proprietary drivers).
2: It doesn't see my display port connection. Running xrandr just shows LVDS and VGA connection, shouldn't the display port show up as well? On a side note up unitl yesterday xrandr responded with LVDS1 and VGA1, but after updating to 3.2 kernel it now responds with LVDS2 and VGA2?
3: Sometimes when I boot it thinks the vga is connected and boots with the wrong resolution. Running xrandr VGA says connected even though no cable is connected, running xrandr --output VGA1 --off --output LVDS1 --auto (or VGA2 and LVDS2 as of yesterday) fixes the issue.
Regards
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Hello OMGitsUGOD,
i run into the same problems with my t420s, at least problems 2 and 3. I did not try to use optimus or discrete graphics settings in BIOS. I think there is something in the wiki about this, maybe you should take a look at that? https://wiki.archlinux.org/index.php/Le … IA-Optimus
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