Red Hat Bugzilla – Bug 467357
i945 default resolution on external LCD incorrect
Last modified: 2018-04-11 10:40:06 EDT
Created attachment 320634 [details]
Description of problem:
Upon starting gdm and then Xorg, the resolution on the external LCD is incorrect. Pressing a button on the monitor itself tells me that it is being driven at 1280x1024 @ 60Hz.
Note, this bug is similar to bug 466870, but _not_ a dup. In the other bug, the driver _never_ was able to drive the external LCD at native resolution, no matter what, until the magic stanza was added to xorg.conf.
In this bug, we can get native resolution on the panel, but requires the following steps:
1) modify xorg.conf as per bz #466870
2) open an xterm and issue 'xrandr --output VGA --auto'
In other words, even though I have an xorg.conf that should do the right thing, I still need to manually issue xrandr before I get correct output.
Version-Release number of selected component (if applicable):
Version : 2.4.2
Release : 12.fc10
100%, upon every reboot
Steps to Reproduce:
1. Power on, wait for gdm
2. get crappy resolution, login
3. open xterm, issue xrandr to fix
External panel driven at 1280x1024
External panel driven at native resolution (1440x900)
Thanks for the bug report. We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue.
Please attach your X server config file (/etc/X11/xorg.conf) and X server log file (/var/log/Xorg.*.log) to the bug report as individual uncompressed file attachments using the bugzilla file attachment link below.
Could you please also try to run without any /etc/X11/xorg.conf whatsoever and let X11 autodetect your display and video card? Attach to this bug /var/log/Xorg.0.log from this attempt as well, please.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 320775 [details]
xorg.conf generated by: Xorg -configure
This is the xorg.conf I am using. I generated it by issuing: Xorg -configure. I then patched it this way:
Viewport 0 0
+ Virtual 2048 2048
The "Virtual" line is what lets me get native resolution (1440x900) on my external panel (after issuing xrandr). If I do not specify the "Virtual" line, then xrandr will _never_ set the external panel at native resolution, and remains stuck at 1280x1024.
Created attachment 320777 [details]
Xorg.0.log *without* an xorg.conf
I did a bit more testing, and realized that I do not need the xorg.conf from comment #2 to get native resolution on my panel (after xrandr).
I realize things are getting a bit confusing, so let me clarify.
1) this bug is: Xorg does not auto-detect native panel resolution
2) I am using the default Xorg configuration. I am _not_ using an xorg.conf anymore
3) the attachment from comment #3 is still valid.
4) please disregard the original Xorg.0.log and disregard the attachment in comment #2
5) after logging in, I can successfully issue xrandr --output VGA --auto and I get the correct resolution
I have similar problem:
* using no xorg.conf so using auto configuration
* on boot configuration is always 1024 x 768
* changing resolution with System->preferences->hardware->screen
has no effect.
* changing screen resolution on command line with xrandr does work:
xrandr --output LVDS --mode 1280x800
xrandr --output VGA --mode 1600x1200
As you can see from xrandr 1024x768 is least common denominator resolution:
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1600 x 1600
VGA connected 1024x768+0+0 (normal left inverted right x axis y axis) 408mm x 306mm
1600x1200 60.0 +
1280x1024 75.0 60.0
1280x960 75.0 70.0 60.0
1152x864 75.0 70.0
1024x768 75.0* 70.1 66.0 60.0
800x600 72.2 75.0 60.3 56.2
640x480 75.0 72.8 75.0 66.7 59.9
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1280x800 60.0 +
1024x768 85.0 75.0* 70.1 60.0
800x600 85.1 72.2 75.0 60.3 56.2
640x480 85.0 72.8 75.0 59.9
TMDS-1 disconnected (normal left inverted right x axis y axis)
TV disconnected (normal left inverted right x axis y axis)
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.
More information and reason for this action is here:
Since this bugzilla report was filed, there have been several major updates in various components of the Xorg system, including Intel driver, which may have resolved this issue.
To be more precise, Intel has undergone a major rewrite during Fedora 10, 11 and 12 cycles, and whole driver is working a lot better now. Users who have experienced this problem are encouraged to retry with at least Fedora 12 Beta and see if the issue is still relevant.
Please, if you experience this problem on Fedora 12 Beta or up-to-date system running Rawhide, let us now in the comment for this bug, or whether the upgraded system works for you.
If you won't be able to reply in one month, I will have to close this bug as INSUFFICIENT_DATA. Thank you.
We hope to see how many older bugs in Intel driver are still relevant today, in hope that most of them were fixed in rewrite process.
[This is a bulk message for all open Fedora 10 i810-related bugs (39 of them are still open). I'm adding myself to the CC list for each bug, so I'll see any comments you make after this and do my best to make sure every issue gets proper attention.]
I originally reported my bug for F10.
After upgrading to F11, the resolution on my external panel is detected correctly at boot.
I'm ok with closing this bug, but we should see what Stephen says first.
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We are sorry, but the Fedora Project is will soon stop longer releasing bug fixes or any other updates for this version of Fedora. There were so many changes between Fedora 10 and Fedora 12 in Intel driver and X.Org that it's very likely that this bug is fixed. This bug will be set to CLOSED:WONTFIX to reflect this, but please reopen it if the problem persists after upgrading to the latest version of Fedora (version 12), which is available from: