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Old 11-19-2016, 08:49 AM   #1
Registered: Sep 2009
Distribution: ubuntu 21.04
Posts: 64

Rep: Reputation: 15
debian: change resolution

Hi there. I'm trying to change my screen resolution (default one is 1024x768 while maximal supported one is 1366x768).
My videocard is:
ice@ice-debian:/boot$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Park [Mobility Radeon HD 5430/5450/5470]
I've tried to install proprietary drivers but after that xserver doesn't even start. So i rolled back to xserver-xorg-video-ati.

My system is
oot@ice-debian:/boot# uname -a
Linux ice-debian 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux
I've also tried to install resolution manually as mentioned
there but xrandr fails with error
xrandr: Failed to get size of gamma for output default
Later i found that xorg and xrandr are not compatible anymore (there)
and for this moment i don't know what to do anymore.
My Xorg.0.log is in attach
Attached Files
File Type: log Xorg.0.log (111.6 KB, 17 views)
Old 11-19-2016, 09:03 AM   #2
LQ Sage
Registered: Nov 2004
Location: Saint Amant, Acadiana
Distribution: Gentoo ~arch
Posts: 7,231

Rep: Reputation: Disabled
[     4.502] (II) [KMS] drm report modesetting isn't supported.
[     4.502] (EE) open /dev/dri/card0: No such file or directory
[     4.502] (WW) Falling back to old probe method for modesetting
[     4.502] (EE) open /dev/dri/card0: No such file or directory
Required kernel driver is not loaded. As a result VESA fallback driver is used, this is why you get the low resolution picture, xrandr needs proper driver loaded and it will work. Don't you believe that old post, back then nVidia proprietary driver didn't support xrandr, it does now.
Old 11-19-2016, 01:08 PM   #3
Registered: Sep 2009
Distribution: ubuntu 21.04
Posts: 64

Original Poster
Rep: Reputation: 15
OK, i was able finally to fix it. The problem was that proprietary driver 'fglrx' added 'radeon' driver to blacklist so even after removing of 'fglrx' 'radeon' still was blocked. So, i removed appropriate file from /etc/modprobe.d/ and regenerated initrd. And everything works now.


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