Problems with Latest Kernel/Firmware and UDLFB

[ggalt]

All:

I've had a nicely functioning USB display through my Raspberry Pi that I'm using for a music player (see the writeup at: http://www.instructables.com/id/Wall-Mounted-SqueezePlayer-with-Raspberry-Pi/ if you are interested). After the latest kernel and firmware update, my USB display flashes on and off and never becomes active and dmesg shows the following:
[ 5.560942] udlfb: DisplayLink MIMO - serial #1071007608
[ 5.560981] udlfb: vid_17e9&pid_0335&rev_0120 driver's dlfb_data struct at c69ee000
[ 5.560993] udlfb: console enable=1
[ 5.561003] udlfb: fb_defio enable=1
[ 5.561011] udlfb: shadow enable=1
[ 5.588361] udlfb: vendor descriptor length:23 data:23 5f 01 0021 00 04 04 07 00 01
[ 5.588393] udlfb: DL chip limited to 1500000 pixel modes
[ 5.591590] udlfb: allocated 4 65024 byte urbs
[ 5.690902] udlfb: 800x480 @ 59 Hz valid mode
[ 5.690940] udlfb: Reallocating framebuffer. Addresses will change!
[ 5.692695] udlfb: 800x480 @ 59 Hz valid mode
[ 5.692721] udlfb: set_par mode 800x480
[ 5.722743] udlfb: DisplayLink USB device /dev/fb1 attached. 800x480 resolution. Using 1504K framebuffer memory
[ 22.961556] udlfb: open /dev/fb1 user=1 fb_info=c500f400 count=1
[ 22.961661] udlfb: released /dev/fb1 user=1 count=0
[ 22.962714] udlfb: open /dev/fb1 user=1 fb_info=c500f400 count=1
[ 22.992700] udlfb: /dev/fb1 FB_BLANK mode 0 --> 1
[ 25.520301] udlfb: /dev/fb1 FB_BLANK mode 1 --> 0
[ 25.653527] udlfb: /dev/fb1 FB_BLANK mode 0 --> 0
[ 25.889490] udlfb: released /dev/fb1 user=1 count=0
[ 30.769819] udlfb: open /dev/fb1 user=1 fb_info=c500f400 count=1
[ 30.769924] udlfb: released /dev/fb1 user=1 count=0
[ 30.770852] udlfb: open /dev/fb1 user=1 fb_info=c500f400 count=1
[ 30.793878] udlfb: /dev/fb1 FB_BLANK mode 0 --> 1
[ 36.378711] udlfb: /dev/fb1 FB_BLANK mode 1 --> 0
[ 36.478428] udlfb: /dev/fb1 FB_BLANK mode 0 --> 0
[ 36.547048] udlfb: released /dev/fb1 user=1 count=0


The last set of opening the device, blanking and then releasing the device occurs over and over again, which is what I'm seeing as the display flashing. I've got the 3.10.21-1-ARCH kernel and raspberrypi-firmware-bootloader 20131130-1.

First, I'd like to try downgrading to the prior kernel and firmware to see if that fixes things, is there a place that I can get the prior packages? If not, I've got a backup image of my SD from early November that I can put into service to see if I can isolate the issue.

Does anyone have any other suggestions about how to tackle this one?

George

[WarheadsSE]

Check your pacman cache @ /var/cache/pacman/pkg

[ggalt]

OK, I tried a downgrade to 3.6.11-18-ARCH+, but there was no change in the behavior. I'm going to load the old image I have from November 7th and work my way through the upgrades to see what triggers the problem.

If anyone else has any ideas in the meantime, please let me know.

George

[ggalt]

OK, I did a little research -- one-by-one uninstalling the packages upgraded during my last upgrade . . . UGH! It turns out that it was the upgrade of sdl_gfx from 2.0.24-2 to 2.0.25-1. So this is not an issue for this board as it seems that it is an issue for a file my xinitrc file loads that relies on the sdl_gfx library. This cause the X session to end when the program couldn't load. Sorry for the noise.

[pepedog]