Absolutely does not change a thing!
vga=791 just tells the kernel to use the framebuffer at a specified resolution, but some believe this to be a waste of resources. vga=normal is the basic text mode boot-up, and still gets the job done.
By default Knoppix 3.3/3.4 feeds
vga=791
to the kernel, which virtually everywhere I try results in an alarming and user-unfriendly
"You passed an undefined mode number"
error message.
(See lots of discussion at
http://www.knoppix.net/forum/viewtopic.php?t=4625
)
I've tried just leaving this out of my isolinux.cfg, and it seems to work fine.
But the Knights Who Made Knoppix must have put it in there for a reason...
What downside is there to just leaving the thing out so that my users don't get freaked out by the error message?
Absolutely does not change a thing!
vga=791 just tells the kernel to use the framebuffer at a specified resolution, but some believe this to be a waste of resources. vga=normal is the basic text mode boot-up, and still gets the job done.

HP DL580 G9 4U Server 4x Xeon E7-8890 v3 2.5Ghz 72-Cores | 512GB RAM | 4x 1TB
$2619.99
Dell EMC PowerEdge R440 Xeon silver 4215 2.5GHz 16 GB ram 2x 550W PSU No HDD
$275.00
Microsoft Windows Server 2022 Standard 64-bit License & DVD 16 Core US Shipping
$34.99
Broadcom 9600-24i Tri-Mode RAID Controller 4.0 NVMe SAS SATA NEW 05-50111-01003
$639.69
Dell Poweredge R720 8SFF 2.5" x Xeon E5-2680 v2 2.8GHz 20-Cores 128gb 4x Trays
$349.99
Dell Poweredge R720 8SFF 2.5" 2x Xeon E5-2680 v2 2.8GHz 20-Cores 64gb 4x Trays
$259.99
Dell PowerEdge R620 2x Xeon E5-2630 v2 3.1GHz 2.5" 4-BAY 32GB RAM No OS 2x 495w
$174.95
Supermicro 1027GR-TSF 1U Rackmount Server 2x Xeon 2.3GHz 128GB DDR3
$219.99
WINDOWS SERVER 2025 [REMOTE DESKTOP SERVICES] 50 USER RDS CAL SEALED
$119.18
Remote Desktop User & Device RDS CALs for Windows Server 2025, 2022 & 2019
$179.99