Created attachment 72799 [details] Xorg log Just recently updated my system from Xubuntu 12.04LTS with fglrx driver to Xubuntu 12.10 with Xorg radeon driver. After bootup screen goes black with monitor reporting "Input not supported". Further investigation shows KMS is trying to default the resolution to 1400 x 1050 which is not supported by the monitor. I can switch to the terminal and run this command to force the correct resolution: XAUTHORITY=/var/run/lightdm/root/\:0 xrandr --output DVI-0 --mode "1440x900" -d :0.0 Rebooting the system results in the same scenario above. System specs ATI Radeon FireGL RV630 V3600 Acer 19" display AL1917WA w/DVI ouput Kernal 3.5.0-21-generic Xorg 1.13.0 Mesa 9.0-0ubuntu1 Xubuntu 12.0 Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz
Please attach your dmesg output. Also, it looks like you have a incorrect preferred mode specified in your xorg.conf: [ 774.834] (II) RADEON(0): Output DVI-0 using monitor section Configured Monitor [ 774.834] (**) RADEON(0): Option "PreferredMode" "1440x990" Does removing that help?
Created attachment 72809 [details] dmesg
Also, I don't know whether it is a bug in your EDID or not, but your monitor claims to support 1440x1050: [ 774.886] (II) RADEON(0): Supported standard timings: [ 774.886] (II) RADEON(0): #0: hsize: 1400 vsize 1050 refresh: 75 vid: 20368 [ 774.886] (II) RADEON(0): #1: hsize: 1440 vsize 900 refresh: 75 vid: 3989 [ 774.886] (II) RADEON(0): #2: hsize: 1280 vsize 1024 refresh: 60 vid: 32897 [ 774.886] (II) RADEON(0): #3: hsize: 1280 vsize 960 refresh: 60 vid: 16513 [ 774.886] (II) RADEON(0): #4: hsize: 1280 vsize 800 refresh: 75 vid: 3969 [ 774.886] (II) RADEON(0): #5: hsize: 1280 vsize 800 refresh: 60 vid: 129 [ 774.886] (II) RADEON(0): #6: hsize: 1152 vsize 921 refresh: 76 vid: 36977 [ 774.886] (II) RADEON(0): #7: hsize: 1152 vsize 864 refresh: 75 vid: 20337
removing [ 774.834] (II) RADEON(0): Output DVI-0 using monitor section Configured Monitor [ 774.834] (**) RADEON(0): Option "PreferredMode" "1440x990" made no difference
Created attachment 72919 [details] xorg log
After rewriting the xorg.conf file, the system now boots into the Xubuntu login screen. The xorg.conf file forces a 1440x900 resolution. The xorg log still reports that the display is still trying to default to 1400x1050 but that it is a bad resolution. Research on this Acer monitor states that 1440x900 is the preferred or native resolution for the monitor. For whatever reason the fglrx driver had no problems obtaining the correct resolution but the xorg driver does. Attaching the xorg log, dmesg, and xorg.conf files for comparison.
Created attachment 72921 [details] xorg conf
Created attachment 72922 [details] dmesg
Does it work correctly if you remove your xorg.conf altogether? The monitor is providing the 1400x1050 mode. If it indeed doesn't support it, we should add a quirk for your monitor to ignore that mode.
Deleting the xorg.conf file causes the system to revert back to the black screen with the "input not supported" message. Once restored, the system booted into the Xubuntu login screen. 1400x1050 is not a supported mode according to the display manual.
Created attachment 73095 [details] [review] possible fix The attached kernel patch should fix the issue.
Hi, Freedesktop's Bugzilla instance is EOLed and open bugs are about to be migrated to http://gitlab.freedesktop.org. To avoid migrating out of date bugs, I am now closing all the bugs that did not see any activity in the past year. If the issue is still happening, please create a new bug in the relevant project at https://gitlab.freedesktop.org/drm (use misc by default). Sorry about the noise!
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