More testing, this time also with Xubuntu 18.10, 32 bit. 1. Testing in my Toshiba laptop (link in my previous comment)
I needed the boot option nomodeset to get 'more than an underscore' on the screen. Then the boot process of a *cloned* USB drive as well as a persistent live USB drive (by mkusb) ended at spamming messages of EHCI- pci overflow. So there is a difference between Lubuntu and Xubuntu: A persistent live Lubuntu 18.10 (by mkusb) works without any tweaks in the Toshiba, but the corresponding Xubuntu does not work. It seems to me that Lubuntu is not stuck by the EHCI bug; it boots via grub in this 64-bit computer. Using nomodeset with a *cloned* Lubuntu USB drive, there was some spamming of EHCI-pci overflow, but after a few seconds to booting continued and later on it got stuck at /init: line 7: can't open /dev/sr0: No medium found 2. Testing in my Intel NUC https://www-ssl.intel.com/content/www/us/en/nuc/nuc-kit-nuc6i3syh.html Xubuntu 18.10, 32 bit needs the boot option nomodeset to get 'more than an underscore' on the screen also in this computer. But then it boots happily and works like it should, both from a *cloned* USB drive and a persistent live USB drive (by mkusb). Lubuntu 18.10, 32 bit, a *cloned* USB drive as well as a persistent live USB drive (by mkusb), booted with the boot option nomodeset did not spam of EHCI-pci overflow, but got stuck after writing [OK] Started Update UTMP about System Runlevel Changes. Summary So the results are somewhat opposite in the Intel NUC compared to the Toshiba laptop: Xubuntu can work in the NUC and Lubuntu can work in the Toshiba. The performance of the 32-bit versions of 18.10 are flaky in 64-bit computers. I suspect that there are several bugs, and the EHCI- pci overflow is only one of them. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1794922 Title: lubuntu 18.10 x86 (32bit) image fails to load "ehci-pci 0000:00:a.7: dma_direct_map_sg: overflow 0x000000016e3f3000+2048 of device mask ffffffff" repeats Status in linux package in Ubuntu: Confirmed Status in linux package in Debian: Unknown Bug description: -- Background -- Testing the x86 (32bit) ISO image on various machines. After zsync download, the thumb-drive is tested ("check disk for defects") & passes; and worked fine on two systems today (dell d610 & hp dx6120), however -- Issue -- dell 755 (desktop) & hp dc7700 (small form factor) it just sits at lubuntu plymouth screen. switching to messages, it's just the following repeating // on dell 755 "ehci-pci 0000:00:1a.7: dma_direct_map_sg: overflow 0x000000016e3f3000+2048 of device mask ffffffff" // on hp dc7700 "ehci-pci 0000:00:1a.7: dma_direct_map_sg: overflow 0x0000000162317000+2048 of device mask ffffffff" NOTE: I can't copy/paste from systems, as it never completes boot; I left it >30mins (on 755) & it just kept repeating message. I've manually typed it; so typo's could have been made. A discussion on #lubuntu-devel provided a possible cause (Thank you Walter!) - --- <wxl> guiverc: lyorian: http://debian.2.n7.nabble.com/Bug-908924-dma-direct-map-sg-overflow-on-USB-access-after-upgrade-to-kernel-4-18-td4387757.html <wxl> seems like it's a usb issue of some kind with 4.18 --- This fits because whilst I do my testing mostly on d610 & t43 (no issues today), I'd tested Lubuntu 18.10 before on the dell 755 with no issues. My last test was also long enough ago to be on 4.17 kernel (suspicion) --- // on hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600) [ 99.999999] ehci-pci 0000:00:1d.0:dma_direct_map_sg: overflow 0x0000000223ad7000+2048 of device mask ffffffff errors on booting 'live' (see #16) for real BUT the same ISO works fine on same box when a virtual machine (Virtual box on a GNU/Linux host and "Type: Linux Version: Ubuntu (32-bit)" virtual machine) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794922/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
