To start, a bit of configuration:
It's a card with a VGA and a DVI output.% lspci
01:00.0 VGA compatible controller: ATI Technologies Inc RV610 video device [Radeon HD 2400 PRO]
My monitor is a Samsung SyncMaster 2232bw (it seems to have something to do in the story). Its native resolution is 1680x1050
I just switch to 10.10 and discovered that the radeonhd driver is no more supported.
Problem: the "radeon" (or "ati", as it's the same) driver does not work well for me:
- if I use the DVI output, I just get a blank screen
- with the VGA output, I get a really *really* bad image, difficult to describe: its blurred, or with kinds of waves, as if there was a lot of interferences. It's almost not usable at 1680x1050, better at lower resolutions
Fglrx does not work either, at 1680x1050 I get a "flashing" image (screen goes blank every 2 seconds or so), and at lower resolution the screen is flashing (but less frequently)
"Vesa" driver works perfectly, both on VGA and DVI, but I can not use 1680x1050 with them, only 1280x1024.
It uses to work perfectly at 1680x1050 with radeonhd driver.
So, it seems that there is something wrong with either my card, the screen, or the combination of the two. But for now, with Ubuntu 10.10, I have no solution to have a clean display at my screen native resolution.
Changing from KMS with radeon.modeset=0 as no consequence.
What could be the problem ? Bad EDID from the screen ? Hardware problem (but if so, why it workred with radeonhhd?) ?
Any idea ?
Joined: Xorg.log for VGA and DVI