I update my rawhide F21 to kernel 3.15.0-0.rc5.git0.1.fc21, but with this kernel I have a bad resolution, 1024x768, but my laptop work with 1600x900. Output of xrandr (version 1.4): [dominique@host ~]$ xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768 default connected primary 1024x768+0+0 0mm x 0mm 1024x768 61.0* 800x600 61.0 640x480 60.0 [dominique@host ~]$ Same output with kernel 3.15.0-0.rc2.git0.1.fc21 : [dominique@host ~]$ xrandr Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192 LVDS-1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 382mm x 215mm 1600x900 60.0*+ 1152x864 60.0 1024x768 59.9 800x600 59.9 640x480 59.4 720x400 59.6 640x400 60.0 640x350 59.8 VGA-1 disconnected (normal left inverted right x axis y axis) HDMI-1 disconnected (normal left inverted right x axis y axis) [dominique@host ~]$ With this kernel I have a good resolution, 1600x900. It's a bug or not ?
Please attach the output of dmesg from both the good and bad kernels.
Created attachment 895199 [details] Dmesg with bad kernel Dmesg with bad kernel
Created attachment 895201 [details] Dmesg with good kernel Dmesg with good kernel
In your good kernel version dmesg, you're using the nouveau driver which is loading properly. In your bad kernel version dmesg you have nouveau blacklisted, so it isn't loading at all. I'm guessing at some point you installed the proprietary nvidia driver and that stopped working. Fedora doesn't provide or support the nvidia driver, so we can't help with issues there. If you aren't using the nvidia driver, I have no idea why nouveau is blacklisted. Remove the blacklist and see if it works.
Thank for your response, that solve problem. I used nvidia drivers but I remove it because they don't work with kernel 3.15.0-0.rc5 (problem with ABI version). I don't know why nouveau is blacklisted with this kernel, but I remove that in grub.conf and I have the good resolution. I closed this bug as notabug. Thank.