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Tried this recently on a new thin laptop that comes with UEFI and Windows 8. I made a bootable Slackware ISO image, processed it so it is USB bootable then wrote it to a USB stick as per instructions found in http://taper.alienbase.nl/mirrors/sl...nux/README.TXT, then tried booting in UEFI mode off the USB, Grub menu came up and I booted the non-kms option, unfortunately I got an unreadable console (and the penguins are badly mangled too)
Anyone had a similar issue?
One of your images (all the bits of words all over the place) is a classic problem of horizontal frequency. Every box is/was supposed to come up at 640x480x60hz initially and then you can set fancy settings if you want. I guess the fancy stuff is going wrong.
I installed Slackware by booting in legacy mode, this went smoothly as usual. At that point I set up elilo, grub2 and rEFInd in the EFI partition, rebooted and switched back to UEFI mode.
Grub2 and elilo booted into the scrambled console. However, booting via rEFInd either directly or by chainloading elilo (or grub2) worked, not really sure why. May be rEFInd somehow sets up the correct resolution and/or framebuffer?
It turns out rEFInd is using graphics mode by default, Grub2 and elilo are not during EFI boot. The Slackware EFI boot off the USB image runs in console mode.
When chainloading Grub2 or elilo off rEFInd they somehow kept the correct mode, otherwise they'd boot into a scrambled screen. I managed to EFI boot directly off Grub2 (without rEFInd) by setting the gfxmode, setting the gfxpayload to "keep" and switching to a gfx terminal. Also a font has to be loaded off the file system (not available on the Slack USB) otherwise you'll get an unreadable menu once you switch to the gfx terminal but booting would still work once you press enter on an item.