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nighthawker
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Joined: 07 May 2014
Posts: 3

PostPosted: Wed May 07, 2014 6:37 pm    Post subject: 2560x1440 resolution lost after update Reply with quote

after an update and reboot, I lost 2560x1440 resolution on one of my three monitors. It is the one monitor of 3 (all the same) running on a DVI output. It is dual link. I was working at 2560 before I rebooted.


from Xorg.0.log...

[ 338.984] (II) fglrx(0): Printing probed modes for output DFP9
[ 338.984] (II) fglrx(0): Modeline "1920x1080"x60.0 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[ 338.984] (II) fglrx(0): Modeline "1600x1200"x60.0 162.00 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync (75.0 kHz e)
[ 338.984] (II) fglrx(0): Modeline "1680x1050"x60.0 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz e)
[ 338.984] (II) fglrx(0): Modeline "1400x1050"x60.0 162.00 1400 1664 1856 2160 1050 1201 1204 1250 +hsync +vsync (75.0 kHz e)
[ 338.984] (II) fglrx(0): Modeline "1280x1024"x75.0 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[ 338.984] (II) fglrx(0): Modeline "1280x1024"x60.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[ 338.984] (II) fglrx(0): Modeline "1440x900"x60.0 162.00 1440 1664 1856 2160 900 1201 1204 1250 +hsync +vsync (75.0 kHz e)
....

any ideas or help would be appreciated.
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geeksheik
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Joined: 07 Sep 2003
Posts: 95
Location: Zürich, Switzerland

PostPosted: Sat May 17, 2014 6:39 am    Post subject: Reply with quote

I've had the same frustrating experience; for me it seems to be tied to the kernel version.

What I've found is that I can only get 2560x1440 with kernel version (gentoo-sources) 3.11.10, which is no longer included in the portage tree, nor is any kernel from the 3.11.x series

I have not been able to get 2560x1440, and max out at 1920x1080 in the following kernel versions:
linux-3.10.25-gentoo
linux-3.10.26-gentoo
linux-3.12.7-gentoo
linux-3.13.9-gentoo
linux-3.14.3-gentoo

I'm using the following integrated graphics controller:
Quote:

00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)


I've tried to keep the settings consistent as possible across kernel versions.
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geeksheik
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Joined: 07 Sep 2003
Posts: 95
Location: Zürich, Switzerland

PostPosted: Fri Jun 27, 2014 9:57 pm    Post subject: Reply with quote

So I decided to revisit this issue tonight and found a couple of solutions.

Until now, I've been using gentoo-sources-3.11.10 in order to get 2560x1440 @ 60Hz. I tried approximately a dozen different kernel versions and that was the only one that worked on boot.

Today, I tried kernel version 3.15.1; it yielded the same results.

I then followed some instructions in a post on the ArchLinux wiki, which got the resolution working on 3.15.1:

Code:
xrandr --newmode "2560x1440_33.00"  162.77  2560 2688 2960 3360  1440 1441 1444 1468  -HSync +Vsync
xrandr --addmode HDMI1 2560x1440_33.00
xrandr --output HDMI1 --mode 2560x1440_33.00

from:
https://bbs.archlinux.org/viewtopic.php?id=179120

2560x1440, but at 33Hz. The performance seemed a bit questionable, but I didn't fully test it. I assume this will also work with other kernel versions.

Then I had an 'oh duh' moment as I read about DisplayPort and realized that I have a DP connector on both my monitor and my integrated graphics controller. I'd initially disregarded it as something that looked like HDMI and was probably meant for television, not a monitor. :oops:

I tried it out and I could instantly see an improvement in display quality over my DVI connection with kernel 3.11.10.

xrandr now shows the following:
Quote:
DP1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440 60.0*+


Hopefully someone finds this useful.
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nighthawker
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Joined: 07 May 2014
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PostPosted: Tue Jul 01, 2014 4:16 pm    Post subject: 2560x1440 working @33hz Reply with quote

geeksheik,

thanks for the reply. after many weeks of suffering with 1920x1080, I am again working at 2560x1440 on my 3rd monitor. I followed the instructions in the URL to the archlinux forum you posted above.

kernel version: 3.15.0-gentoo
x11-drivers/ati-drivers Installed versions: 13.12
x11-base/xorg-server Installed versions: 1.14.6

solution:

$ gtf 2560 1440 33

# 2560x1440 @ 33.00 Hz (GTF) hsync: 48.44 kHz; pclk: 162.77 MHz
Modeline "2560x1440_33.00" 162.77 2560 2688 2960 3360 1440 1441 1444 1468 -HSync +Vsync

$ xrandr --newmode "2560x1440_33.00" 162.77 2560 2688 2960 3360 1440 1441 1444 1468 -HSync +Vsync
$ xrandr --addmode DFP5 2560x1440_33.00
$ xrandr --output DFP5 --mode 2560x1440_33.00

at this point my KDE bombed out. I think because I neglected to add a position for the DFP5. I restarted X, logged in and saw the new resolution available....

$ xrandr | grep -A 5 DFP5
DFP5 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440 33.0*+
1800x1440 33.0
1856x1392 33.0
1792x1344 33.0
1920x1200 33.0

I also (at some point) added the line Modeline below to the appropriate monitor section of /etc/X11/xorg.conf for the xserver to add the mode automatically

Section "Monitor"
Identifier "0-DFP5"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Modeline "2560x1440_33.00" 162.77 2560 2688 2960 3360 1440 1441 1444 1468 -HSync +Vsync
Option "PreferredMode" "2560x1440"
Option "TargetRefresh" "60"
Option "LeftOf" "DFP9"
Option "Rotate" "normal"
Option "Disable" "false"

I think the above is working. I am going to reboot and test. My display it all good at the moment. 2560x1440 on the left (through DVI), 2560x1440 on center (display port + dual link adapter), and right 2560x1440 (display port + dual link adapter). I set the resolutions and positions via CLI and xrandr.

I am going to reboot and make sure everything comes up good again.
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