[sf-lug] framebuffer console hangs...
b79net at gmail.com
Wed Aug 20 13:49:43 PDT 2008
While in text mode in a framebuffer console, I'm having issues with
the display 'hanging'. For example, while moving the text cursor in
Vim, the cursor will sometimes freeze for 3 or 4 seconds then jump
ahead the distance it would've moved while frozen. Or while scrolling
text in Less, the text will freeze then jump ahead in the same manner.
When switching between terminals in GNU Screen there can be a several
second pause...quite annoying.
This is on a Thinkpad X40 booting and running off a 12GB CompactFlash
card (Sandisk Exteme III) using an IDE-CF adapter . The distro is
Debian unstable, via the grml live-CD  installed to hard-disk. Not
sure if the problem is related to using a a Flash HD...I've run other
machines off CF without this issue. The X40 uses shared video memory.
Someone at Monday's JavaCat meeting suggested trying a different
video driver for the framebuffer. Here's what I have on board:
vbe: VESA 3.0 detected.
oem: Intel(r)852GM/852GME/855GM/855GME Graphics Chip
Accelerated VGA BIOS
vendor: Intel Corporation
product: Intel(r)852GM/852GME/855GM/855GME Graphics Controller
Hardware Version 0.0
Reading through /usr/share/doc/.../Documentation/fb/intelfb.txt.gz
led me to try this in /etc/lilo.conf :
append="video=intelfb:mode=1024x768-24 at 60,accel,hwcursor "
Taking a look in dmesg, there doesn't seem to be any reference to
intelfb, just vesafb:
Boot video device is 0000:00:02.0
vesafb: framebuffer at 0xe0000000, mapped to 0xe0280000,
using 6144k, total 8000k
vesafb: mode is 1024x768x32, linelength=4096, pages=1
vesafb: scrolling: redraw
vesafb: Truecolor: size=8:8:8:8, shift=24:16:8:0
Console: switching to colour frame buffer device 128x48
fb0: VESA VGA frame buffer device
When loading intelfb manually:
# modprobe intelfb
intelfb: Framebuffer driver for Intel(R)
intelfb: Version 0.9.4
ACPI: PCI Interrupt 0000:00:02.0[A] -> GSI 16 (level, low) -> IRQ 16
intelfb: Cannot reserve FB region.
And the hanging display issue persists. Am I on the right track trying
to use intelfb? Is the Framebuffer video driver a likely culprit?
Could it be something else? Any suggestions regarding how to diagnose
the problem would be much appreciated.
 AD44MIDE2CF IDE to 2 CF slots Adapter for Notebook
(note: only one slot is really usable...the 'slave' slot
is realllly slow, no DMA)
 grml - Linux Live-CD for sysadmins / texttool-users / geeks
More information about the sf-lug