mythfrontend on fglrx: startup crash "floating point exception"

[jerome]

Binary package hint: mythtv

I had mythfrontend working fine. I setup my radeon 9550 to be dual display. Worked fine there too. I was able to start it on the left or right (which is a TV) screen.
I then decided to change the resolution of the second screen (TV) down to 640x480 (from 800x600). Mythfrontend now crashes on startup. I tried to change the resolution back to 800x600 but it still crashes.

[nes (eric-lesport)]

Just to add that I have the exact same problem using a Radeon X1900 with the 8.32.5 fglrx driver and MythTV 0.20 from the repos.

[jerome (jeromen)]

Just FYI, for other reasons I have moved that PC back to a Windows platform. I unfortunately won't be in a position to test a solution.
Great looking package while it ran though, maybe I'll be able to go back one day.
Thanks.

[dishevld (dishevld)]

I also am seeing :"floating point exception" error when attempting to start mythtv in terminal. If I attempt to launch mythtv from the applications menu, nothing visually happens (it just doesn't launch).

To 'correct' the problem, I have to set the resolution for my Radeon 9250 card to the highest setting (1024x768).

What is unfortunate is that this resolution makes Ubuntu look like crap on my TV (though the GUI in mythtv looks fine).

I came across this problem while troubleshooting a problem with the viewable area of LiveTV (image is too large for screen).

I will attach files.

[dishevld (dishevld)]

Added Note: The previous crash log file was after attempting to run mythtv setup from Terminal. But I get the same crash id I attempt to start mythtv frontend with a lower screen resolution.

[Secesh (matt-mattchase)]

I have Radeon 9550 with fglrx. Mythtv will not run (frontend or setup) locally. I can run them through SSH with x-forwarding, but locally, I get "Floating point exception" -- at any resolution. I show 1024x768, 800x600, and 640x480. none work.

[Mario Limonciello (superm1)]

Try launching mythfrontend like this:
 LD_PRELOAD=/usr/lib/fglrx/libGL.so.1.2.xlibmesa mythfrontend

On 2/19/07, Secesh <email address hidden> wrote:
>
> I have Radeon 9550 with fglrx. Mythtv will not run (frontend or setup)
> locally. I can run them through SSH with x-forwarding, but locally, I
> get "Floating point exception" -- at any resolution. I show 1024x768,
> 800x600, and 640x480. none work.
>
> --
> mythfrontend startup crash - floating point exception
> https://launchpad.net/bugs/77291
>

--
Mario Limonciello
<email address hidden>

[dgoodrum (dgoodrum)]

I also encounter this problem. I have a Radeon X1300. If I restore from a backup, it works again. I tried the launching with the command suggested by Mario, but it still gives me a floating point exception.

I have attached the crash report.

[Alex Chiang (achiang)]

This looks like it's due to https://launchpad.net/ubuntu/+source/qt-x11-free/+bug/81686 .

You can verify by running 'xdpyinfo | grep resolution'. If you get some huge crazy numbers, then that's probably it.

The workaround is to manually set the DPI information. I did this in my xorg.conf file in the Monitor section. You need to add the following line:

        DisplaySize xxx yyy

To calculate xxx, multiply the horizontal resolution of your display by 25.4 and then divide that answer by 96.

To calculate yyy, do the same with your vertical resolution.

For my 800x600 setup, I used the following line:

        DisplaySize 211 158

Restart X and then rerun xdpyinfo | grep resolution to verify that you successfully changed the DPI setting. I got mythtv working again using this.