On Thu, 07 Sep 2017, DM wrote: > I am not sure exactly what may be the cause of the issue, and I am > reaching out to you for help to identify what part of Debain might be > causing this issue.
This sounds like your monitor might not be returning the correct EDID or Debian isn't handling it appropriately. > The issue: I am using a second monitor (external monitor connected via > a displayport - LG 29UM57-P). External monitor connected to my laptop > - Lenovo T420. External monitor does not display video at the desired > resolution and the aspect ratio. > > Displayed resolution - 1920 x 1080 > Displayed aspect ratio - 16:9 > > Expected resolution - 2560 x 1080 > Expected ratio - 21:9 > > This same exact issue exist on my other machine Lenovo X230 with > external monitor of exact same model. These machines all use the intel graphics driver, so you should file this bug against the xserver-xorg-video-intel package. [You can verify that by checking /var/log/Xorg.0.log and seeing if you see lots of "intel(0)" lines there.] > Previous version of Debian 8 (jessie) worked with out any issue with > the monitor at the correct and expected resolution and the aspect > ratio. > > After installing a fresh version of Debian 9 (Stretch), I am unable to > use the external monitor at its maximum resolution. Debian 9 (Stretch) > was a full installation from scratch (not an upgrade). When you file the bug, please also include the output of xrandr --verbose; -- Don Armstrong https://www.donarmstrong.com They say when you embark on a journey of revenge dig two graves. They underestimate me. -- a softer world #560 http://www.asofterworld.com/index.php?id=560