Public bug reported: After upgrading to Trusty, my Dell U2711 won't run at its native 2560x1440. Instead, resolution is limited to 1920x1200.
However, if I connect this monitor via displayport, it works fine; it also worked fine in 13.10. Some weird things: apparently, the driver thinks the DVI port is actually an HDMI port. I found bugs #859389 (old), #890088 (mint, nvidia not intel), and #980453 (also nvidia, also old) which also refer to false recognition as an HDMI port. I found a thread (in german) http://forum.ubuntuusers.de/topic/2560x1440 -funktioniert-ploetzlich-nicht-mehr-d/ which sounds exactly like my problem. Attempting to force the resolution with xrandr didn't work (and resulted in some odd errors I can't interpret), but using the results of "gtf 2560 1440 30.0" (i.e. 30fps not 60) at least temporarily worked, but the display (predictably) looks pretty laggy. I'm not sure what graphics driver is running (though I'm pretty sure it's the default for haswell) nor how to tell, but I'll reboot and generate a clean(ish) Xorg log and attach that. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: driver dvi graphics haswell xorg -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1311476 Title: Upgrade to Trusty breaks 2560x1440 over DVI on intel haswell Status in “linux” package in Ubuntu: New Bug description: After upgrading to Trusty, my Dell U2711 won't run at its native 2560x1440. Instead, resolution is limited to 1920x1200. However, if I connect this monitor via displayport, it works fine; it also worked fine in 13.10. Some weird things: apparently, the driver thinks the DVI port is actually an HDMI port. I found bugs #859389 (old), #890088 (mint, nvidia not intel), and #980453 (also nvidia, also old) which also refer to false recognition as an HDMI port. I found a thread (in german) http://forum.ubuntuusers.de/topic/2560x1440-funktioniert-ploetzlich- nicht-mehr-d/ which sounds exactly like my problem. Attempting to force the resolution with xrandr didn't work (and resulted in some odd errors I can't interpret), but using the results of "gtf 2560 1440 30.0" (i.e. 30fps not 60) at least temporarily worked, but the display (predictably) looks pretty laggy. I'm not sure what graphics driver is running (though I'm pretty sure it's the default for haswell) nor how to tell, but I'll reboot and generate a clean(ish) Xorg log and attach that. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311476/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
