Red Hat Bugzilla – Bug 139982
boot "vga=788 single" gives no console display
Last modified: 2015-01-04 17:12:31 EST
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Description of problem:
Booting with the GRUB line
kernel /vmlinuz-2.6.9-1.648_EL ro root=LABEL=/RHEL4b2 vga=788 1
gives no display on the console. This works in RHEL3WS and FC3 to
give a 37 row by 101 column character display [and single user mode].
The harddrive activity light flashes as during a successful boot, but
the console display contains nothing [although it is not "blanked":
the LCD backlight is on.]
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot with "vga=788 1" instead of "rhgb quiet".
Actual Results: Console display is empty: all black, not even a
cursor (but the LCD backlight is on.)
Expected Results: Console display contains boot commentary, and
eventually a root shell prompt "# ".
Video card is ATI Technologies Inc Rage 128 Pro Ultra TF (1002:5446;
174b:7106) and /etc/sysconfig/hwconf says it uses fb0.
thats very odd, as FC3 is pretty much the same kernel.
Using "vga=ask 1" works, mostly. The 37x101 mode is not listed, not
even after entering "scan" and waiting a minute for the new list to
appear. The closest mode is "8 030A 132x43", and entering "8\r" does
give 43 rows by 132 columns, UNTIL "Setting default font
(latarcyrheb-sun16)" changes it to 25 rows. (The number of columns
after the change to 25 rows is too tedious to count, but looks like
more than 100 and less than 132.) ["vga=ask" works just like this in
RHEL3 and FC3.]
Rechecking, "vga=788 1" does give 37x101 in RHEL3 (2.4.21-20.EL) and
FC3 (2.6.9-1.678_FC3), but gives an empty black screen in RHEL4-Beta2.
Typing "reboot\r" succeeds in getting back to the BIOS and GRUB.
Still fails after up2date to today's kernel-2.6.9-1.675_EL. Also,
booting the FC3 kernel-2.6.9-1.678_FC3 using the RHEL4-Beta2 root
filesystem _works_ with "vga=788 1". So something between 675_EL and
678_FC3 is the problem.
fixed in cvs
Closing out. Please reopen if the problem is still present with recent code.