Posts Tagged ‘ati’

Ubuntu Grub2 Refresh Rate Problems

May 20th, 2014 No comments

I had to make a few changes to /etc/default/grub to get Ubuntu 14.04 to boot with a working console. Initially, my monitor just went dark.

Changes with reasons:

GRUB_HIDDEN_TIMEOUT: if you want to see the Grub menu, this must be commented out.

GRUB_CMDLINE_LINUX: allows passing parameters to the linux startup command. Newer kernels (>3.5? or so) reinitialize the graphics card. My AMD Radeon something-or-other didn’t like this at all. nomodeset forces linux to use/keep BIOS graphics settings.

GRUB_GFXMODE: select resolution for Grub graphical starup. 1280×1024 works on my aging ViewSonic. This setting is for the Grub menu.

GRUB_GFXPAYLOAD_LINUX: specifying keep, causes Grub to keep using the previous resolution (from GRUB_GFXMODE) for the rest of the boot. 

NB: after making any changes, remember to update-grub (or nothing will happen).

Contents of my /etc/default/grub after making required changes:

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD …)

# Uncomment to disable graphical terminal (grub-pc only)

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo’

# Uncomment if you don’t want GRUB to pass “root=UUID=xxx” parameter to Linux

# Uncomment to disable generation of recovery mode menu entries

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE=”480 440 1″

Categories: Linux Tags: , , , , , , ,

Dualhead on ThinkPad T60p Running Ubuntu Hardy

September 8th, 2008 No comments

Somehow my ThinkPad (T60p) desktop never seems big enough so whenever possible I like to plug in a second monitor. Until recently, Ubuntu required all sorts of messing around in xorg.conf, but fortunately the situation is somewhat improved with Hardy. To be fair, much of this configuration mess is probably due to ATI’s less than stellar Linux support, which is slowly improving.

First, always backup your existing /etc/X11/xorg.conf !!!  Virtually every screen config tool I’ve used under Linux has ultimately toasted my xorg.conf file.

I found “amdcccle” produced the best results, with Compiz still operational.

Others may prefer “aticonfig –initial=dual-head“, which also worked but left my Compiz out of action.

Both are far from perfect and this is one area where Ubuntu (and other distros) still lag far behind Windows and OSX.

Categories: Uncategorized Tags: , , , , , ,